Boiler plant



Patented Dec. 7, 1926. l Y.

stica i MAX KEL'TING, or nostrani, enaIirAnY.

Animation' heengaan-1924; sensi No. 730,653, and in Germany' Magen- 5,1924;

My invention refers to' boiler plants and its object is to provide meanswhereby the utilization of heat iii boiler plantswis mcreased andirendered more' efficient than has hitherto been possible. Y

In boiler plants comprising means for heating the boiler with gaseous,liquidV or solid finely subdivided fuel, such as pul- Ver'ized coal,the'4 heat energy of tlie fuel has been stored in periods of lowersteaml consumption by hea'tinga heat storage such as Cowpers Vstove in,orderto' be able during periods of higher steam consumption to preheatthe air of combustion by causing it to pass through the.' heat storage'.In` boiler plants-heated withcoke'v oven* gas or blast furnace gas the`contn-i'ially flowing current ofv gas canfbe consumed in' spiteT ofthe/noir uniform steam consumption, the provision of gas tank-'s beingthereby avoided. But a'lls2 in boiler plants heated with' other kinds offuel the storing of the heat has proved useful inasmuch' asbypreheatinfgthe air of combustionthe steani production canz be increased50% or more without the volume of fitte' gas bec'oming larger and?without the temperature of the' waste gases being raised, the heated airof combustion not only increasing the heat' supply, but also the usefuldrop in temperature and in consequence thereof also the steamproduction. In the boiler plant according to the present invention theboiler is combined with the heat storage in such manner that the gasesof combustion issuing from the burner, which is common to both parts ofthe combination, can be distributed according to requirements. It isthus possibleto supply'only so much heat to the boiler as corresponds tothe heat consumption for the time being, the steam in excess being ledinto the heat storage. If the steam consumption rises, a simple reversalwill cause the air of combustion to pass through the heat storage,taking up the heat stored therein so that in this manner the excess heatresulting from a former operation is led back below the boiler. Inconsequence thereof the supply of fuel and air need be regulated only atlarger intervals, if it is found that the heat storage receives too muchor too little heat. VIn gas heated furnaces or in furnaces provided witha burner fed with oil 0r pulverl ized coal by means of an air or steamjet the ener jy of flow of the jet can be utilized for simp ifying thereversal or regulation.

Referrin'gto thedrawings, a isv the upper drunr and b arethev tubes of awater tube boiler, which' are heatedy bythe re gases in theusua-lmanner, the gases of combusn tion escaping through` the main iiuec. ef is a burner suppliedv with gas, oi-l or pulverizecl fuel fromamain cl. InI periods of low steam consumption, fory i instance inz `the.intervals between twohoisting operations in a mine, the burneraspirescol-dair fromwithout through the fresh air cond-uit. f and.carries it along Ythrough the mixing nozzle gl into the combustionvchamber li'. Underneath this chamberthe hea-t storage z' is mountedcom; prising a refractory checker work o-fvsome well known kind. r: isan opening in the bottom of theA combustion chamber forming connectionbetween tliisch'aniber *and the heat storage, whereby. part off the firegases is drawn through theuhea't Storage z', giving off its heat energyand esca'pi-ng-throughi the conduit Z into the main flue c provi-dedthat' they reversibleiiap m assu-mes the position shownl in' Fig. l. l

If theheat'storage isv heated up "in this manner and if the steambconsumption increases', the` reversible fla-p: is shifted into theposition shown in Fig. 2. Inasmuch as this operation takes place at thecooler end of the heat storage, no diiiiculties are encountered,inasmuch as no parts need be operated which are exposed to greater heat.With the reversible flap m in the position shown in Fig` 2, the suckingaction of burner e will now cause fresh air from with-v out to be drawnin through the conduits n and Z, this air being compelled to travelacross the heat storage i before entering the way of the conduit 7. Inconsequence thereof the reversible flap m also provides for a suitablemixing of cold and hot air. If the reversible flap m is placed in anintermediate position, the heat storageor generator i is thrown out ofaction not only as a heat storage, but also as air heater. This positionis imparted to the reversible flap during periods of average steamconsumption where the consumption of steam corresponds to the normalquantity of fuel consumed in the furnace, if this latter is suppliedwith cold air from without.

A boiler plant combined with a heat storage as shown and described canbe operated in the simplest manner and even more easii ly than anordinary boiler. Vxith a uniform supply of fuel the attendant needmerely adjust the reversible flap in -correspondence to the variationsof steam pressure, a fresh regulation of the burner becoming necessaryonly when greater diiferences arise between the heat energy to bedistributed on the boiler and the heat storage on the one hand, andsteam consumption on the other hand. Obviously the operation of thereversible 'Hap can also be effected by any of the well known automaticdevices, for instance from a piston acted upon by the steam pressure inthe boiler. u

I wish it to be understood that I do not desire to be limited to theexact details of construction shown and described, for obviousmodifications will occur to a person skilled in the a-rt.

I claim:-

1. Boiler plant comprising a boiler, a Source of hot gases, a heatstorage and means whereby Veither said hot gases are made to flow partlyin contact with said boiler and partly through said heat storage orfresh air is drawn through said heat storage and caused( to mix withsaid hot gases.

Boiler plant comprising a boiler, a burner, a heat storageand meanswhereby the hot gases emanating from said burner arefmade to flow partlyin contact with said boiler and partly through said heat storage orfresh air is drawn through said heat storage and caused to mix with saidhot gases.

3. Boiler plant comprising a boiler, a heat f, storage, a fresh airconduit leading below said boiler and to said heat storage, a burnerprojecting into said conduit, a main `flue and reversing means wherebyeither the hot gases emanating from said burner are made to flow partlyin Contact with said boiler and partly through said heat storage orfresh air is drawn through said Vheat storage in opposite direction andcaused to mia with said hot gases.

Il. Boiler plant comprising a boiler, a heat storage, and a directconnection between said heat storage and the lower side of said burner,a fresh air conduit leading below said boiler and to said heat storage,a burner projecting into said conduit, a main iiue and reversing meanswhereby either the hot gases emanating from said burner are made to flowpartly in contact with said boiler and partly through said heat storageor fresh air is drawn through said heat storage in opposite directionand caused to mix with said hot gases. Y

In testimony whereof I affix my signature.

MAX KELTING.

